← Back to Sessions

Monitoring Groundwater Dynamics at Lyon Water Catchment Using Seismic Attenuation Variations From Train Signals

Description: 

Understanding and monitoring groundwater dynamics are crucial undertakings in contemporary hydrology and hydrogeophysics. Monitoring subsurface physical properties using single seismic stations poses a challenge. We introduce a novel methodology to monitor subsurface attenuation variations using train signals. We can measure the seismic attenuation over time by quantifying the relationship between these variations and the train signal frequency content.

This single-station approach allows local continuous subsurface monitoring, providing new observables to understand the groundwater dynamics. Lyon water catchment presents an excellent case study due to its recharge system and good instrumentation. It is a complex and strategic site that provides 87% of the city's drinking water. Being located near a highly urbanized area, the aquifer is very sensitive to pollution risks. The site uses an artificial recharge system through several infiltration basins built around the pumping areas to protect the groundwater from river pollution and maintain the groundwater level.

We applied this method during four weeks when two major events occurred at Lyon water catchment: a flood following the release of a dam upstream of the wellfield and a few days later, a 8-day controlled water infiltration experiment. By comparing measured attenuation with environmental observations (e.g., rainfall, bassin level, Piezometer level, noise correlation-based velocity changes), we can gain valuable insights into the complex interactions within the aquifer system.

Our research showcases the potential of using seismic attenuation variations from train signals to study and monitor groundwater dynamics in a context like Lyon water catchment. Seeking continuous monitoring offered by this method will lead to a deeper understanding of subsurface processes and contribute to better management of vital groundwater resources.

Session: ESC-SSA Joint Session: Climate Change and Environmental Seismology - I

Type: Oral

Date: 5/3/2024

Presentation Time: 02:45 PM (local time)

Presenting Author: Laura

Student Presenter: No

Invited Presentation: 

Authors